Abstract
The localization of carboxylic ester hydrolases (EC 3.1.1) activity in Aspidogaster conchicola was investigated by light microscopy. Activity appears to be due to a mixture of simple esterases and cholinesterases. The haptor reacted positively with α-naphthyl acetate and 5-bromoindoxyl acetate and was inhibited by sodium fluoride thus indicating the presence of simple esterases. The gut reacted with α-naphthyl acetate, 5-bromoindoxyl acetate and acetylthiocholine iodide. Activity was not affected by inhibitors of simple esterases or low concentrations of diethyl- p-nitrophenyl phosphate (E600) but was inhibited by eserine sulfate. These results indicate that the gut contains a mixture of cholinesterase and type C esterases or a cathepsin.
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